Computation of SIFs for Cracks in Cold-Worked Holes
Abstract: Reliable prediction of crack growth and residual strength in metallic structures require accurate computation of SIFs. Since analytical solutions for complex configurations are not available, estimates of SIFs have to be obtained by numerical methods such as the FEM. The particular case of cracks emanating from cold worked holes is of practical importance. To account for residual stresses in the computation of SIFs, two approaches were investigated:
- modified J-integral with the J → K conversion
- contour integral method for loaded cracks (CIM-LC)
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“At DST Group, we have effectively used StressCheck® over the last 10 years to determine accurate stress intensity factors. The results have been used to improve our residual strength and structural life estimates for aircraft in service with the Royal Australian Airforce, including C-130, P-3C and F/A-18 A/B. We have found it to be extremely easy to use and a very versatile code with which to create parametric models.
We have recently used StressCheck® to obtain improved stress intensity factor solutions (Improved stress intensity factors for selected configurations in cracked plates and Improved stress intensity factors for a single corner crack at a loaded fastener hole) for five key generic configurations. These transferable parametric results have been published externally. One specific example is the non-linear contact analysis of a cracked, filled fastener hole, with both fastener and remote plate loading.”
Dr. Manfred Heller, HeadStructural & Damage Mechanics, DST Group